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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
/*
* Include this file into a mainboard DSDT inside the PCI device
* "Northbridge Miscellaneous Control (Northbridge function 3)" and it
* will expose the temperature sensor of the processor as a thermal
* zone.
*
* Families 10 through 14 and some family 15 CPUs are supported.
*
* If, for example, the NB Misc. Control device is on 0:18.3, include
* the following:
*
* Scope (\_SB.PCI0) {
* Device (K10M) {
* Name (_ADR, 0x00180003)
* #include <soc/amd/common/acpi/thermal_zone.asl>
* }
* }
*
* Do not include this if the board is affected by erratum 319 as the
* thermal sensor of Socket F/AM2+ processors may be unreliable.
* (Erratum 319 affects AM2+ boards, AM3 and later should be fine)
*/
#ifndef K10TEMP_HOT_OFFSET
# define K10TEMP_HOT_OFFSET 50
#endif
#define K10TEMP_KELVIN_OFFSET 2732
#define K10TEMP_TLIMIT_OFFSET 520
OperationRegion (TCFG, PCI_Config, 0x64, 0x4)
Field (TCFG, ByteAcc, NoLock, Preserve) {
HTCE, 1, /* Hardware thermal control enable */
, 15,
TLMT, 7, /* (LimitTmp - 52) / 0.5 */
, 9,
}
OperationRegion (TCTL, PCI_Config, 0xa4, 0x4)
Field (TCTL, ByteAcc, NoLock, Preserve) {
, 21,
TNOW, 11, /* CurTmp / 0.125 */
}
ThermalZone (TZ00) {
Name (_STR, Unicode ("AMD CPU Core Thermal Sensor"))
Method (_STA) {
If (LEqual (HTCE, One)) {
Return (0x0F)
}
Return (Zero)
}
Method (_TMP) { /* Current temp in tenths degree Kelvin. */
Multiply (TNOW, 10, Local0)
ShiftRight (Local0, 3, Local0)
Return (Add (Local0, K10TEMP_KELVIN_OFFSET))
}
/*
* TLMT indicates threshold where HTC become active. That is the processor will limit
* P-State and power consumption in order to cool down.
*/
Method (_PSV) { /* Passive temp in tenths degree Kelvin. */
Multiply (TLMT, 10, Local0)
ShiftRight (Local0, 1, Local0)
Add (Local0, K10TEMP_TLIMIT_OFFSET, Local0)
Return (Add (Local0, K10TEMP_KELVIN_OFFSET))
}
Method (_HOT) { /* Hot temp in tenths degree Kelvin. */
Return (Add (_PSV, K10TEMP_HOT_OFFSET))
}
Method (_CRT) { /* Critical temp in tenths degree Kelvin. */
Return (Add (_HOT, K10TEMP_HOT_OFFSET))
}
}
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